Rushdie unleashes his imagination on an alternate world informed by the surreal logic of video games, but the author's entertaining wordplay and lighter-than-air fantasies don't amount to more than a clever pastiche. A sequel of sorts to Haroun and the Sea of Stories, this outing finds Haroun's younger brother, Luka, on a mission to save his father, guided, ironically, by Nobodaddy, a holograph-like copy of his father intent on claiming the old man's life. Along the way, they're joined by a collection of creatures, including a dog named Bear, a bear named Dog, hybrid bird-elephant beasts, and a princess with a flying carpet. As with video games, Luka stores up extra lives, proceeds to the next level after beating big baddies, and uses his wits to overcome bottomless chasms and trash-dropping otters. Rushdie makes good use of Nobodaddy, and his world occasionally brims with allegory (the colony of rats called the "Respectorate of I" brings the Tea Party to mind), but this is essentially a fun tale for younger readers, not the novel Rushdie's adult fans have been waiting for. (Nov.)